Above, U.S. Sen. Jim Jeffords gives the thumbs-up while driving his tractor at his Shrewsbury home in 2001 just after leaving the Republican Party. At right, Jeffords is shown at the beginning of his Senate career in 1989 with the man he was replacing, Sen. Robert Stafford.

I’ve been thinking about the summer day I drove to Shrewsbury to interview Jim Jeffords for Vermont Magazine. Jeffords had just weeks before given up the longest-held Republican seat in the U.S. Senate, simultaneously returning Senate control to the Democrats and in so doing becoming, if briefly, a household name.

I found him perched upon an old Ford tractor, his hair awry, and a goofy grin spreading across his face as he waved my way. He was mowing his overgrown meadow, as oblivious to the slight trickle of blood on his forehead, the result of absentmindedly driving into a branch, as he was to the messages clogging his answering machine.

Later, we talked in the comfy house he and his wife, Liz Daley, called home. Jeffords took the chair that had been shredded by the family cat. One minute he was joking to Liz not to dare throw the tattered thing out and the next describing the clarity he experienced when he was in Vermont. He explained that he had waited to make the announcement to become an independent here rather than in D.C. because Vermont and Vermonters always reminded him of what mattered most: personal integrity.

At the end of the interview, he posed this unexpected question: “Would you give me some writing lessons?”

Due to his overnight fame, Jeffords had been offered a two-book contract from Simon & Schuster. Staff members, especially Mark Powden, had essentially written the first, entitled “My Declaration of Independence.” Jeffords thought he could write the second, a reflective biography of his political life, by himself. By the end of his first “writing lesson,” however, it was clear that, while he had made quite a scene with his defection, he needed more than advice on how to create one on the page.

For the next eight months, Jeffords and I spent what sometimes felt like a lifetime together as we worked on “An Independent Man,” the biography published in 2002. That summer and over the winter holiday, we worked through breakfast and lunch at my kitchen table in Rutland. I made the mistake of asking his favorite sandwich: peanut butter, lettuce and mayonnaise.

When he left at 4 p.m. to meet Liz, who was undergoing chemotherapy at the Rutland hospital, I’d spend the night reading incredibly boring documents called legislative journals, which are essentially the record of each congressman’s or senator’s daily activities, and prepare questions for the next day.

Early on, it became apparent that Vermont would not be the place it is today without Jeffords. Credit him with no billboards, some of the nation’s first and most progressive environmental regulations, a cleaner Lake Champlain and healthier family farms.

As a journalist, I knew about these efforts, but until I dove into the details, I had little appreciation of the personal dramas that accompanied the David and Goliath battles he’d waged on the state’s behalf against such giants as International Paper over Lake Champlain or the beverage industry over Vermont’s ban on certain nonreturnable bottles.

Nailing down those details could prove challenging, but what fun and pride he took, telling how he and his friend John Hansen, who was the first of the staff attorneys he hired as Vermont attorney general, outwitted heavily financed lawyers representing the outdoor advertising industry or International Paper. One of Jeffords’ proudest possessions was a bumper sticker that read, “Jeffords Won’t Let ‘Em Do It in the Lake.”

That fall and winter, after I returned to my job at San Francisco State University and he to Washington, I’d fly each weekend to D.C., where we worked in his little hideaway office at the bottom of the Senate building. Much larger events had eclipsed what turned out to be Jeffords’ small rearrangement of the political landscape. 9/11 had happened. Jeffords’ fellow senator from Vermont, Patrick Leahy, had been the target of an anthrax-contaminated letter.

Every plane trip was rife with paranoia, and Washington felt like a place under siege with cement barricades everywhere, non-essential government buildings closed to the public, and security guards and X-ray machines at the entrance to the Hart Senate Office Building. Jeffords may have been the darling of the Democrats, but he was persona non grata among Republicans.

Once, for example, en route to the Senate dining hall, Jeffords’ former friend, Sen. Trent Lott of Mississippi, with whom he’d performed as part of the quartet called the Singing Senators, stopped the elevator and stormed off when Jeffords stepped in. Jeffords simply moved into the place Lott had vacated and quipped, “So much for harmonizing.”

We were keen to make the book more than the story of his defection, but rather a serious examination of his life in relation to the issues that mattered most to him — the environment, education, and veterans’ rights — and the importance of public service. On one of those bleak winter afternoons, Jeffords handed me a small green booklet, saying, “Here, you might find this interesting.” Interesting, indeed.

It was the confidential report of his investigation (along with Democratic Sen. Terry Sanford of North Carolina) into whether Ronald Reagan and his campaign committee had orchestrated the late release of the Iran hostages in order to defeat President Carter in the 1980 election. The hostages had for 10 years been demanding such an inquiry.

One of the more disturbing questions was whether or not George H.W. Bush, then Reagan’s running mate, had participated in these efforts. Now Bush was president and the hostages had brought their request to the Senate subcommittee on Near Eastern and South Asian Affairs, which Jeffords chaired. His fellow Republicans were dead set against the investigation. The Senate denied Jeffords’s request for subpoena powers and refused special funds for such an investigation. But Jeffords went forward anyhow, using the limited resources of his subcommittee.

The inquiry soon became mired in stories of intrigue and acts of obfuscation. FBI videos of suspect arms dealers who claimed to have planned an arms-for-hostages deal with Bush and Reagan’s campaign director, William J. Casey, went missing, and most of the major players, including Casey, had died.

In “An Independent Man,” Jeffords summarized his feelings about the investigation this way: “Few decisions I have made before leaving the Party in May 2001 have angered my fellow Republicans more. I suppose I could have walked away from the investigation. … Yet, if I had, I felt that the allegations against Reagan and our party would forever haunt us. And didn’t the hostages and the American people have a right to know the truth? As it turned out, the Republicans had little to fear. Or did they? To this day, it’s hard to say what is true.”

In the book, Jeffords is particularly forthcoming about his own failings, especially in regard to his outspoken and rather liberal wife, and the struggles that she had with alcohol and prescription drugs. He was able to put their personal struggles in perspective with the women’s movement and the confounding effect it had on men who had grown up in a different era.

Jeffords’s mother had not questioned her role as wife to his father, Olin Jeffords, who had been chief justice of the Vermont Supreme Court, but, as explained in “An Independent Man,” Liz Daley “had had a vibrant career before we married, one that took her to exciting places and provided the opportunity to meet all sorts of interesting people and stretch herself mentally. She had willingly given that up to advance my career and to be a mother. But she had done so with the understanding that she would be a partner in my career, yet now I was too busy most of the time to even have a half-hour chat with her.”

This impasse led to their divorce in 1979 after 18 years of marriage; they remarried 25 years to the day of their first wedding. Reflecting on the choice of the day, Jeffords said, “Like the proverbial screw-up husband, I often forgot that important date but had finally gotten it planted in my memory before the divorce. Replacing it with another anniversary date might have been difficult.”

As with his marriage, Jeffords either just didn’t get or wouldn’t accept the growing distance between his fellow Republicans and himself. Most pundits believe it all came to a head during budget talks shortly after President George W. Bush’s election. Jeffords could not understand why in a time of huge surpluses, Bush’s tax cuts for the wealthy had to come with a substantial reduction in education aid to children with disabilities, a cause Jeffords supported throughout his political career.

He tried unsuccessfully to negotiate the issue but in the end voted in favor of an amendment by Sen. Tom Harkin, a Democrat from Iowa, to reduce Bush’s tax cut by $450 billion and divide the money between education and debt reduction. By then, it was clear that reconciliation was impossible for Jeffords and the party he had grown up in.

Despite these struggles, Jeffords remained optimistic about the future of political life. A final chapter in “An Independent Man” begins with these words:

“I sometimes think about our young people and wonder how they feel about our political process and their place in it. After fifty years of assassinations, Watergate, and so many other scandals, and the contentious race for president in the last election, it would not be unreasonable to be jaded about democracy and public service. Indeed, I worry that our best and brightest youngsters are already turned off to the concept of public service.

“But I am here to tell you that, despite the obstacles that are inherent in our system, despite the polarization that too often infects the White House and Congress, and despite the shenanigans and gamesmanship of Beltway politics, I have faith. I still believe that one person can make a difference. My life proves that.”

Yvonne Daley, a former Rutland Herald reporter, co-authored Jeffords’s “An Independent Man,” and is the author of three other nonfiction books. She divides her time between San Francisco, where she is a journalism professor, and Vermont, where she directs the Green Mountain Writers Conference.